build(deps): bump Newtonsoft.Json in /src/Discord.Net.Core (#2527)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 13.0.1 to 13.0.2.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/13.0.1...13.0.2)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

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src/Discord.Net.Core/Discord.Net.Core.csproj

@@ -11,7 +11,7 @@
     <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
     <PackageReference Include="System.Interactive.Async" Version="5.0.0" />
     <PackageReference Include="IDisposableAnalyzers" Version="3.4.15">
       <PrivateAssets>all</PrivateAssets>